Following the startling events of "New Krypton" and the shocking occurrence in the Phantom Zone, Earth finds itself without its greatest protector! Luckily, Metropolis still has a few heroes, like Mon-El and the Guardian. But after years of knowing nothing but the solitude of the Phantom Zone, how will Mon-El acclimate himself to society? And the recently returned Guardian has his hands full with his new position in the Science Police. How can they fill Superman's shoes? They'd better figure it out fast, because dangerous mysteries abound!